From template engine to template engine-use ASPX page as a template engine implementation

This article is entirely touched and I have seen many templates on the Internet. Article But I feel more and more things we do
It is waiting for a long distance.
What is a template engine? To put it bluntly, the placeholder replacement engine can be automatically replaced. In principle, there are two steps. Find-and replace it. However, replacement is not a simple replacement, including:

• Simple variable replacement ();
• Complex variable replacement ();
• Object variable replacement ();
• Key Value Type replacement ();
• Replace a custom set ();
• Multiple variables () are displayed simultaneously ();
• Template call ();
• PASS Parameters () to the calling template ();
• Value template ();
• Simple loop ();
• Delivery cycle display ();
• Template delivery cycle ();
• Condition judgment ();
• Create a template () from the file ();

The commonly used template engine, stringtemplate and velocity are almost all designed in this mode. But is this really what we need? Let's take a typical stringtemplate template.CodeLet's take a look:

First, in the template file:

Name: $ user. Name $ age: $ user. value $

Then in the Code:

User us =   New User ();
Us. Name =   " Xxsssx " ;
Us. Value = " 80 " ;
Stringtemplate St =   New Stringtemplate ( " $ User. Name $, $ user. value $ " );
St. setattribute ( " User " , US );
Console. writeline (St. tostring ());

So let's make a comparison with the ASP. NET code.
ASPX page
<Asp: Label id = "name" runat = "server"/> <asp: Label id = "mail" runat = "server"/>
Aspx. CS File User us =   New User ();
Us. Name =   " Xxsssx " ;
Us. Value = " 80 " ;
Name. Text = Us. Name;
Mail. Text = Us. Value

Is there any difference between using the template engine and getting rid of your pants and farting?
So why should we use the template engine? Is it really necessary or fashionable?
In my opinion, the template engine is needed. The separation of view and control is necessary, but we need to know what is view and what is control. Does a view not contain code or logic? The answer is no, because even if you use stringtemplate, you still need to fill it with data, the code that fills it with data is still a view, not a control, or someone simply treats it as a model. In this case, why can't we use the ASPX page itself as a template? It can be judged, can be cyclic, can be branched, and can be used with ready-made controls. For example

<%
If (helper. islogin ()){
User u = helper. getlogineduser ();
%>
Your name is: <% = U. name %>
<% }%>

We will compare this method with the stringtemplate method.

Aspx template stringtemplate
The Asp.net control is not supported.
Support for complex display logic (not tested for all possibilities)
Editor support not supported
Unsupported compilation detection support

Now I may have a question: how can I call the ASPX page as a template? Why can't I generate a static page when I access it?
In fact, the solution is very simple. You only need server. Execute () to return the execution result of the ASPX page with a textwriter. We are not happy to know how to deal with this problem. Haha

I remember someone mentioned a similar method before, but some people may question: Isn't there any artist or Asp.net? In fact, if you tell the artist <% = u. name %> is the name of the user, so it does not require the artist to learn a full set of Asp.net, but in fact, it is difficult for the artist to learn simple and practical Asp.net, it may be even more depressing to learn the full template syntax of stringtemplate and to learn how to use it flexibly. IfProgramIs C # syntaxes that programmers are familiar with more approachable? In addition, it can intelligently perceive menu and compilation detection support. So I think this method is a great method in most cases.

PS. Now the company has a Java project. I also directly asked the following students to use the JSP page as a template. The response was good and everyone felt very happy :』